Jake is a JV pimp.
After bragging on the streets telling people that he knew who The Ogre was, Jake was brought in for questioning by Detective Harvey Bullock. Bullock and Gordon showed him a sketch of the Ogre, telling Jake that the latter had a very good friend of theirs. Though denying he knew anything, saying he lied, Jake asked them for the sake of argument, if he did know anything, what was Barbara Kean's life worth, promoting Jim to tell Harvey that he was about to break interrogation codes regarding interrogation. After doing so, Gordon was able to get out of him, that Jake worked as a barman, at a brothel called the Foxglove, where the Ogre was a regular.